This part of ISO 3452 specifies a method of penetrant testing used to detect discontinuities, e.g. cracks, laps, folds, porosity and lack of fusion, which are open to the surface of the material to be tested. It is mainly applied to metallic materials, but can also be performed on other materials, provided that they are inert to the test media and not excessively porous (castings, forgings, welds, ceramics, etc.)

BS EN 14015 - SPECIFICATION FOR THE DESIGN AND MANUFACTURE OF SITE BUILT, VERTICAL, CYLINDRICAL, FLAT-BOTTOMED, ABOVE GROUND, WELDED, STEEL TANKS FOR THE STORAGE OF LIQUIDS AT AMBIENT TEMPERATURE AND ABOVE